package juc;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class ShareResource{

    private int number = 1;
    private Lock lock = new ReentrantLock();

    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();

    public void print5(){

        lock.lock();
        try {
            while (number != 1){
                condition1.await();
            }

            for (int i = 0; i < 5; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }

            number = 2;
            condition2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }

    }

    public void print10(){

        lock.lock();
        try {
            while (number != 2){
                condition2.await();
            }

            for (int i = 0; i < 10; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }

            number = 3;
            condition3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }

    }

    public void print15(){

        lock.lock();
        try {
            while (number != 3){
                condition3.await();
            }

            for (int i = 0; i < 15; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }

            number = 1;
            condition1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }

    }

}

/**
 * 多线程之间顺序调用
 *
 * 注意标志位的修改和定位
 *
 * 精准唤醒 精准通知
 */
public class ThreadOrderAccess {
    public static void main(String args[]){

        ShareResource shareResource = new ShareResource();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                shareResource.print5();
            }
        },"A").start();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                shareResource.print10();
            }
        },"B").start();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                shareResource.print15();
            }
        },"C").start();

    }
}
